Mesa Boogie Subway D-800+ Bass HeadThe SUBWAY D 800+ addresses the player who wants enhanced frequency control and an interface for outboard signal processing. The upscale D 800+ preamp features expand upon the acclaimed D 800 by including a comprehensive EQ section with Semi Parametric sweep able LOW and HIGH MID Bands, the addition of a BRIGHT switch, an adjustable HIGH PASS Filter with control from 30Hz to 150 Hz, and on the Rear Panel, a Series Effects Loop, Tuner Output and 1 4